Hammer



FIG. 1 is a perspective view of a hammer, showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is rear front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown are included for the purpose of illustrating the unclaimed portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a hammer, as shown and described. 